为什么我的Django项目无法识别设置中安装的应用程序？

我正在尝试在Django中构建我的投资组合，并在安装我的应用程序后遇到错误。似乎无法识别我的应用INSTALLED_APPS。我已经尝试过使用'blog'，'blog.apps.BlogConfig'但是似乎什么也没有被认可。

我用python manage.py runserver和运行运行服务器，python manage.py runserver但都返回ModuleNotFoundError: No module named 'blog.urls'

这是整个回溯

Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
    self.check(display_num_errors=True)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/core/management/base.py", line 390, in check
    include_deployment_checks=include_deployment_checks,
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/core/management/base.py", line 377, in _run_checks
    return checks.run_checks(**kwargs)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/core/checks/registry.py", line 72, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/core/checks/urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/core/checks/urls.py", line 23, in check_resolver
    return check_method()
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/urls/resolvers.py", line 398, in check
    for pattern in self.url_patterns:
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/urls/resolvers.py", line 579, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/urls/resolvers.py", line 572, in urlconf_module
    return import_module(self.urlconf_name)
  File "/Users/usr/django-portfolio/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/usr/django-portfolio/portfolio/portfolio/urls.py", line 21, in <module>
    path('', include('blog.urls'))
  File "/Users/usr/django-portfolio/env/lib/python3.7/site-packages/django/urls/conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "/Users/usr/django-portfolio/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'blog.urls'

我的INSTALLED_APPS是

INSTALLED_APPS = [
....
'blog'
]

设置中的网址

 from django.contrib import admin
 from django.urls import path, include

 urlpatterns = [
     path('admin/', admin.site.urls),
     path('', include('blog.urls'))
 ]